#app {
    width: 960px;
    margin: 0 auto;
}

#app .header {
    width: 100%;
    margin-bottom: 20px;
}

#app .nav_hd {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 90px;
}

#app .nav_hd .nav_hd_ul {
    display: flex;
}

.nav_bd {
    display: flex;
    background-color: #fff;
}

.nav_bd li {
    position: relative;
    padding: 18px 25px;
    border-right: 1px solid #ccc;
    background-color: #fff;
    cursor: pointer;
}

.nav_bd li a {
    color: #666;
    font-size: 14px;
}

.nav_bd_no {
    display: none;
}

.nav_bd>li>.nav_bd_no>li {
    padding: 10px 10px;
    font-size: 12px;
    border-bottom: 1px solid #ccc;
    line-height: 26px;
    width: 160px;
    /* padding: 0 10px; */
}

.nav_bd>li>.nav_bd_no>li:last-child {
    border-bottom: none;
}

.nav_bd .nav_bd_no {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 1;
}

;
.nav_bd .nav_bd_no li {
    text-align: center;
}